Europe Migrant Crisis - Sept. 17, 2015

Police direct migrants during a stampede to board a bus in Tovarnik, Croatia, Sept. 17, 2015. Croatia said it could not take in any more migrants, amid chaotic scenes of riot police trying to control thousands who have streamed into the European Union country from Serbia.

Migrants help an injured migrant during a stampede to board a bus in Tovarnik.

A policeman helps a migrant as she attempts to board a bus in Tovarnik.

Croatian police officers take control the bus at the Batina border crossing with Serbia, that would take migrants to the center for asylum seekers, near Batina, Croatia.

A group of migrants walk on the road near Bezdan, Serbia, towards Croatia. Thousands of migrants poured into Croatia, setting up a new path toward Western Europe after Hungary used tear gas and water cannons to keep them out of its territory.

A man carrying two children walks along a bridge over the Danube river between Serbia and Croatia, near Batina.

The "Horgos 2" border crossing into Hungary, near Horgos, Serbia.

Refugees wait on a bridge after police stopped them at the border between Austria and Germany in Salzburg, Austria.

Refugees are being supplied with food and water as they wait at the border between Austria and Germany in Salzburg.

In Vienna, Austria, a sports hall is turned into a temporary refugee camp. In this image, two refugee girls sit on a mattress in the sports hall.

Meanwhile, in Turkey, a crowd of migrants, mostly from Syria, wait at the main bus station in Istanbul. Hundreds of Syrians and other migrants thronged a small park in central Istanbul, hoping for a last chance to reach Europe before poor weather makes their favored route from Turkey to Greece too dangerous to undertake.

A migrant child washes his head with water on the side of a highway near Edirne, Turkey. Hundreds of migrants spent the night out in the open near Turkey's border with Greece, after Turkish police halted their bid to reach the frontier and cross into the European Union.

A man show a placard as migrants, mostly Syrians, trying to reach Europe rest outside the Turkish city of Edirne, which borders European Union members Greece and Bulgaria, Sept. 16, 2015.

Authorities in Paris, France, are evacuating more than 500 Syrian and other migrants from tent camps and moving them to special housing as the country steps up efforts to deal with Europe's migrant wave.